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Commitments and Contingencies - Concentrations of Credit Risk (Details) $ in Thousands	3 Months Ended		8 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($) Customer	Sep. 30, 2018 Customer	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 Customer	Jan. 29, 2019 USD ($)	Dec. 31, 2018 USD ($) Customer
Concentration Risk [Line Items]
Current accounts receivable	$ 3,188,328		$ 3,188,328	$ 3,188,328			$ 2,354,737
Customer Concentration Risk
Concentration Risk [Line Items]
Number of customers representing ten percent or more of revenue | Customer	0	0			0
Number of customers representing ten percent or more of net receivable position | Customer							0
Revenues | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk percentage				10.50%
Net Receivables | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk percentage				11.60%
PG&E | Pre-Petition Receivables
Concentration Risk [Line Items]
Accounts receivable	$ 54,000		54,000	$ 54,000		$ 165,000
Current accounts receivable						$ 122,000
Proceeds from collection of pre-petition receivables			111,000
PG&E | Pre-Petition Receivables | Other Assets, Net
Concentration Risk [Line Items]
Accounts receivable	$ 43,000		$ 43,000	$ 43,000

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